Re: secondary diameter vs. toroid minor diameter

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mark W. Stolz by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mark_w_stolz-at-hotmail-dot-com>

Hi Bill,

I am currently running a 7" x 22.5" toroid on my latest coil which has a 4" 
secondary.  I have had no problems with breakout from the secondary which 
I'm guessing is due to shielding by the toroid.
http://users2.ev1-dot-net/~nmyreality/tesla/4inch/4inch.html

FWIW, I'm running a single 15/60 NST at the moment.

Mark Stolz
Houston, TX


>Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><vanyo-at-echoes-dot-net>
>
>Someone once recommended to me that the toroid minor diameter be
>slightly smaller than the secondary diameter, the idea (roughly) being
>that breakout is more likely to occur where radius of curvature is less,
>and you obviously don't want breakout from the secondary.
>
>Make sense?
>
>For my next coil (slow in progress), I have a 9" by 30" spun aluminum
>toroid (the last bulk buy), and am planning on using a 10.75" diameter
>PVC secondary form.  Reasonable?  What diameter secondaries are others
>using with those toroids?
>
>(FWIW - power will be a bank of 15/60 Franceformers, up to 6 of them;
>cap will be up to 9 strings of 11 Geek Group caps, 9 strings being
>0.122uf; and gap will probably be triggered (maybe synch rotary, though
>haven't started on parts collection for that yet))
>
>	- Bill Vanyo